import Vue from 'vue'
import VueRouter from 'vue-router'
import Login from './../components/Login'
import Home from './../components/Home'
import Welcome from '../components/Welcome'
import Users from '../components/user/user'
import Rights from '../components/power/Rights'
import Roles from '../components/power/Roles'
import Cate from '../components/goods/Cate'
import Params from '../components/goods/Params'
import GoodList from '../components/goods/List'
import Add from '../components/goods/Add'
import Order from '../components/order/Order'
import Report from '../components/report/Report'

Vue.use(VueRouter)

const routes = [
  {
    path:'/login',
    component:Login
  },
  {
    path: '/',
    //访问根路径时重定向到/login
    redirect:'/login'
  },
  {
    path:'/home',
    component:Home,
    redirect:'/welcome',
    children:[
      { path:'/welcome', component:Welcome },
      { path:'/users', component:Users },
      { path:'/rights', component:Rights },
      { path:'/roles', component:Roles },
      { path:'/categories', component:Cate },
      { path:'/params', component:Params },
      { path:'/goods', component:GoodList },
      { path:'/goods/add', component:Add },
      { path:'/orders', component:Order },
      { path:'/reports', component:Report },
      ]
  }
]

const router = new VueRouter({
  routes
})

//挂载路由导航守卫，避免没登录就进到页面，拦截作用
router.beforeEach((to,from,next)=>{
//to,将要访问的路径、from从那个路径跳转而来，next函数，表示放行，强制跳转
//登录页直接放行
if(to.path === '/login')  return  next();
//  获取token,从sessionStorage获取token
  const tokenStr = window.sessionStorage.getItem('token')
  if(!tokenStr) return next('/login') //不存在token,则不能跳转页面
  //如果没有return到其他页面,说明token存在,直接放行
  next() //跳转成功
})


export default router
